CVE-2022-48874 (GCVE-0-2022-48874)

Vulnerability from cvelistv5 – Published: 2024-08-21 06:10 – Updated: 2026-08-05 08:52
VLAI
Title
misc: fastrpc: Fix use-after-free and race in fastrpc_map_find
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix use-after-free and race in fastrpc_map_find Currently, there is a race window between the point when the mutex is unlocked in fastrpc_map_lookup and the reference count increasing (fastrpc_map_get) in fastrpc_map_find, which can also lead to use-after-free. So lets merge fastrpc_map_find into fastrpc_map_lookup which allows us to both protect the maps list by also taking the &fl->lock spinlock and the reference count, since the spinlock will be released only after. Add take_ref argument to make this suitable for all callers.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:05 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8f6c1d8c4f0cc316b0456788fff8373554d1d99d , < a50c5c25b6e7d2824698c0e6385f882a18f4a498 (git)
Affected: 8f6c1d8c4f0cc316b0456788fff8373554d1d99d , < 9446fa1683a7e3937d9970248ced427c1983a1c5 (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.8 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.8",
                      "versionStartIncluding": "5.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2",
                      "versionStartIncluding": "5.18",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix use-after-free and race in fastrpc_map_find\n\nCurrently, there is a race window between the point when the mutex is\nunlocked in fastrpc_map_lookup and the reference count increasing\n(fastrpc_map_get) in fastrpc_map_find, which can also lead to\nuse-after-free.\n\nSo lets merge fastrpc_map_find into fastrpc_map_lookup which allows us\nto both protect the maps list by also taking the \u0026fl-\u003elock spinlock and\nthe reference count, since the spinlock will be released only after.\nAdd take_ref argument to make this suitable for all callers."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerability is reached only through local ioctls on /dev/fastrpc-* misc devices (FASTRPC_IOCTL_INVOKE / MEM_MAP / MEM_UNMAP) via fastrpc_device_ioctl \u2192 fastrpc_map_create \u2192 fastrpc_map_find; it is not reachable from network packet processing.\nAC:L - The attacker controls both sides of the race by issuing concurrent ioctls from multiple threads on the same fastrpc fd (e.g. map_find via invoke/mem_map while another thread drops the last map ref via mem_unmap or put_args), so success does not depend on conditions outside attacker control.\nPR:L - fastrpc_device_open performs no capability check, and on typical Qualcomm/Android deployments unprivileged/untrusted contexts can obtain access to the non-secure fastrpc node (directly or via HAL FD passing), so real root/init-namespace privileges are not required.\nUI:N - Exploitation requires only the attacker\u2019s own open/ioctl calls on the fastrpc device; no separate victim action is needed.\nS:U - This is a kernel heap UAF enabling privilege escalation within the same OS security authority; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Use-after-free of struct fastrpc_map lets an attacker reclaim and control the freed object, enabling arbitrary kernel memory disclosure.\nI:H - The same UAF is exploitable for heap spraying and arbitrary write / control-flow hijacking in the kernel, not merely a limited corruption.\nA:H - Use-after-free of the map object can cause kernel oops/panic (and does so even when not fully exploited for code execution)."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:52:45.133Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/a50c5c25b6e7d2824698c0e6385f882a18f4a498"
            },
            {
              "url": "https://git.kernel.org/stable/c/9446fa1683a7e3937d9970248ced427c1983a1c5"
            }
          ],
          "title": "misc: fastrpc: Fix use-after-free and race in fastrpc_map_find",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48874",
        "datePublished": "2024-08-21T06:10:05.081Z",
        "dateReserved": "2024-07-16T11:38:08.921Z",
        "dateUpdated": "2026-08-05T08:52:45.133Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.